Top Speeds for ITS?

Eric Parham

Eric Parham

New member
I'm trying to minimize costs by getting the right R&P the first time. Anyone know top speeds for ITS cars at Road Atlanta, Mid-Ohio, Watkins Glen, NHIS and/or Lime Rock? The project is an ITS GTI VR6, but speed data for any/all ITS cars would be greatly appreciated.
 
My ITS RX7 would do 140 + at Pocono running a 4:88 in 4th. My other RX7 did the same in 5th with a 5:12.
 
LRP: My 4.3 is perfect. No 5th gear on the front straight. Braking into T1 at redline.

NHIS: Again, perfect. No 4th gear anywhere but the front straight. Braking into T6 at redline.

This gear was a significant improvement at these tracks over my 4.88 due to less shifts.
 
My ITS RX7 would do 140 + at Pocono running a 4:88 in 4th. My other RX7 did the same in 5th with a 5:12.
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I would assume you were reading this on the stock speedo on the dash? Great for the EGO but not a chance in the real world. :D 128 at VIR with legal gears and I won't say which one.
 
Oooo, Marty's gonna be pissed if he found out the top speed of a certain ITA car at Mid-Ohio...

;) [/b]
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Dad-gum sissy cars are s'posd tu be slower. What's this world coming to, anyway... :014:



OK, I checked my logs - 118 MPH (based on a Hoosier R6 225/45-15 circum of 72.13"). From the time I nail it in the middle of the keyhole to braking for T7 is 19.5 seconds. I didn't see anyone pulling me on the straight, even Rob when he lapped me.
 
Dad-gum sissy cars are s'posd tu be slower. What's this world coming to, anyway... :014:[/b]
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;)

Yeah, but don't forget: your car "handles". It's obvious that in a tete-a-tete battle you'd kick my butt! The CRXs certainly did!

20.0 seconds, 121.16 mph, GPS-based data acq-derived...
 
;)

Yeah, but don't forget: your car "handles". It's obvious that in a tete-a-tete battle you'd kick my butt! The CRXs certainly did!

20.0 seconds, 121.16 mph, GPS-based data acq-derived... [/b]
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Maybe the car could whup you, but I can't. The egg was 3 seconds faster than me.
 
I would assume you were reading this on the stock speedo on the dash? Great for the EGO but not a chance in the real world. :D 128 at VIR with legal gears and I won't say which one.
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Steve, you know that there are no secrets in ITS anymore. We all KNOW that you run a modified 1.89:1 out a diesel ford courier pick up at VIR. That way you only use first and second gear. Fewer shifts = better lap times.. :P :eclipsee_steering:

You can't fool us.
 
Jim, that's just what it looks like on the shifter tunnel of Steve's car. But I've been to his shop and I know the secret. He's got himself a 2 speed Powerglide in that sucker. I always wondered how he managed to drive with one hand out the window.....

3.45 rear gear on my car, 225/45/13s, I think a .83 fifth gear, about 125 mph at teh end of the backstraight at VIR with the new aero friendly top.
 
Steve, you know that there are no secrets in ITS anymore. We all KNOW that you run a modified 1.89:1 out a diesel ford courier pick up at VIR. That way you only use first and second gear. Fewer shifts = better lap times.. :P :eclipsee_steering:

You can't fool us.
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Busted!! It is the Aussie spec diesel. 3.-- or something like that. You do get to third on the back straight. :P
 
Dad-gum sissy cars are s'posd tu be slower. What's this world coming to, anyway... :014:


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You think Greg's car is a sissy car. First time racing there I think my little ol' plastic sissy car was doing 117mph according to the DL-1?? :P


Sorry, couldn't resist!! :D
 
I would assume you were reading this on the stock speedo on the dash? Great for the EGO but not a chance in the real world. :D 128 at VIR with legal gears and I won't say which one.
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Following Nick's RX7 and the 2 Autotechnic BMWs - Rob had a working speedo in his car. It was a 4 car drafting train - that was the numba, but from a stock speedo in an E36.

I'd agree 130 might be tops without a draft.
 
Following Nick's RX7 and the 2 Autotechnic BMWs - Rob had a working speedo in his car. It was a 4 car drafting train - that was the numba, but from a stock speedo in an E36.

I'd agree 130 might be tops without a draft.
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Just for reference:

I will assume a .76 GTU fifth gear and R6 Hoosier at 22.8 diameter.

With a 4.88 in 4th gear:
8500 = 118
9000 = 125
9500 = 132
10000 = 139

With a 5.12 in 5th
8000 = 140

Remember that a stock speedo does not know you changed tire diameter or rear gear ratio. Great numbers for BS over beer but not real world data.
 
<div align="left">Gear Mph per 1000 RPM Mph @6800 RPM Mph @7300 RPM</div>
<div align="left">--------------------------------------------------------</div>
<div align="left">1 5.08 35 37</div>
<div align="left">2 8.45 57 62</div>
<div align="left">3 12.00 82 88</div>
<div align="left">4 15.96 109 117</div>
<div align="left">5 19.71 134 144</div>
<div align="left"> </div>
<div align="left">This is using a gear calc for my Miata ratios (tranny and 4.3). So:</div>
<div align="left"> </div>
<div align="left">LRP: top for me is about 115-117</div>
<div align="left">NHIS: 108-110</div>
 
Just for reference:

I will assume a .76 GTU fifth gear and R6 Hoosier at 22.8 diameter.

With a 4.88 in 4th gear:
8500 = 118
9000 = 125
9500 = 132
10000 = 139

With a 5.12 in 5th
8000 = 140

Remember that a stock speedo does not know you changed tire diameter or rear gear ratio. Great numbers for BS over beer but not real world data.
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Yup, your stuff above is right on - GTU and 50 series tires running at 8200. Speedo isn't like data aq - I never run a speedo because I only care about time. (PS - now that I recall I think my other rear was a 4:66 - that's what Kip told me when I bought the car in '04 - always got some eyebrows on that one.)

But seriously - only 128 at VIR?

<div align="left">Gear Mph per 1000 RPM Mph @6800 RPM Mph @7300 RPM
Click to expand...

<div align="left">--------------------------------------------------------</div>
<div align="left">1 5.08 35 37</div>
<div align="left">2 8.45 57 62</div>
<div align="left">3 12.00 82 88</div>
<div align="left">4 15.96 109 117</div>
<div align="left">5 19.71 134 144</div>
<div align="left"> </div>
<div align="left">This is using a gear calc for my Miata ratios (tranny and 4.3). So:</div>
<div align="left"> </div>
<div align="left">LRP: top for me is about 115-117</div>
<div align="left">NHIS: 108-110</div>

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That explains your strong Pocono results - that tranny can handle some speed!

So what's my Fiero speed potential? (I'll buy you a soda)
 
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